US2973668A - Automatic transmission - Google Patents

Description

March 7, 1961y R. w. RUMKER AUTOMATIC TRANSMISSION' 5 Sheets-Sheet 1 Filed Aug. 15, 1958 March 7, 1961 R. w. RUMKER AUTOMATIC TRANSMISSION 5 sheets-sheet 2 Filed Aug. 15, 1958 INVENTOR. /Pober l/V. Rum/fer:

March 7, 1961 R. w. RUMKER 2,973,668

AUTOMATIC TRANSMISSION Filed Aug.- 15, 1958 5 SheetS-Sheetl 3 INVENTOR.

Robert W Rum/fer. BY Mm NW' ATTORNEYS.

R. w. RUMKER AUToMATrc TRANSMISSION March 7, 1961 5 Sheets-Sheet 4 Filed Aug. 13, 1958 R O mw Mw d m R 147' TOPNE X3.

March 7, 1961 R. w. RUMKER AUTOMATIC TRANSMISSION 5 Sheets-Sheet 5 Filed Aug. 15, 1958 MoN NON

INVENTOR. Rober! W RumAe/z 7'7' ORNE YG- `and are referred to as automatic transmissions.

AUTOMATIC TRANSMISSION Robert W. Rumker, 611 E. 46th, Kansas City North 16, Mo.

Y FiledAug. 13, 195s, ser. No.7s4,761

11 claims. (ci. 74-688) This invention relates to automatic transmissions, and more particularly to a fluid coupling and variable speed gearing for transmission of power as in automobiles, trucks, tractors, tanks, stationary power units and other such power units `employing transmission of power from an enginge or other power source to a driven shaft at reduced, increased or identical speed or .combination thereof.

Variable speed transmissions employing a Huid coupling or a torque converter and gearing are used on automobiles Such structures require complex controls, such as hydraulic valves, governors, clutches `and brakes for effecting the various speeds which lare subject of malfunction and result in expensive maintenance and-repairs. Also, such transmissions are usually large and heavy and are expensive in Yuse due to the consumption of power thereby.

Some of such transmissions employ torque converters to provide increasedV torque for acceleration of the vehicle from standstill but have limited torque multiplication ability requiring increased engine power for satisfactory starting performance. It is further a common diiiiculty with such transmissions that in taxi push starting, the vehicle must attain a relatively high speed in order to turn the engine sufficiently to start same, making it very diicult tostart the engine when the battery has insufiicient power to operate the starter motor.

The principal objects of the present invention are to Aprovide an improved variable speed transmission with a such a transmission wherein the drive may be direct connected bypassing the fiuid unit at any time for improved low speed economy; to provide such a transmission and iiuid unit arranged to reduce -to a minimum the power consumed thereby and yet require relatively small space in height whereby in automobiles the transmission may be adjacent the differential; to provide such a transmis- `sion which can automatically adapt itself to the required .lgnief1 StaesEvent@ torque demand and pass into drive ratios in a smooth;

imperceptible manner; and to provide an improved automatic transmission and controls therefor which is easy to control `and that is capable of economical manufacture and maintenance in eliicient operating condition.

Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawings wherein are set forth by way of illustration and example certain smbQdimentS 9i invention.

firice Fig. 1 is a vertical longitudinal section through the power transmission incorporating the features of the present invention, with a diagrammatic illustration of the hydraulic system.

Fig. 2 is a vertical transverse sectional view through the transmission on the line 2 2, Fig. l.

Fig. 3 is a vertical sectional view showing the band operating cam on the line 3 3, Fig. 2.

Fig. 4 is a vertical transverse sectional view through the transmission on the line 4 4, Fig. l. p

Fig. 5 is a sectional view through the pump drive taken lon the line 5 5, Fig. 4.

Fig. 6 is a horizontal sectional view showing the band operators taken on the line 6 6, Fig. 7.

Fig. 7 is a partial transverse sectional view through a vehicle showing the connection between the band operators and the transmission.

Fig. 8 is a horizontal sectional view through an hydraulic system governor.

Fig. 9 is a schematic view illustrating the electrical circuits in the transmission control system.

Referring more in detail to the drawings:

The invention is illustrated as applied to a motor vehicle between the engine of the vehicle and the driving wheels; however, it is to be understood that the invention is not limited to such use and is adapted for variable speed transmission from a source of power to a driven member suitably connected to the output thereof. In the illustrated structure, the numeral 1 designates a power source such as an engine of a vehicle having traction wheels 2 on an axle 3 including a differential housing 4 enclosing the usual differential gearing therein. An automatic transmission generally designated by the numeral 5 is interposed between the engine shaft 6 and a driven member 7 such as the pinion shaft of a differential.

The automatic transmissionv is housed in a casing 8 which consists of several sections for convenience of assembly. The forward section 9 includes a front wall 10 secured by suitable fastening devices such as screws 11 to -a peripheral portion 12 which is securedto the forward end of the main casing section 13 having a transverse partition 14 at said forward end of the main section to cooperate with the forward section in defining a chamiber 15 for a first gear train or forward gear set 16.

The main casing section 13 has a partition 17 intermediate its length which cooperates with the partition 14 and said main section to define a hydraulic fluid coupling chamber 1S. The por-tion of the casing rearwardly of the partition 17 houses gear sets 19, 20 and 2l. in the illustrated structure, the rear of the casing is illustrated as ybeing open and having iianges 22 for fastening to a difieren-tial housing 4. However, it is to be understood that in other uses the rear of the casing may be closed and an output sh-aft 22 supported in bearings in the same ymanner as the forward end of the transmission casing and the support of an input member or shaft 23, said casing 8 being such that it houses and provides support and retains oil for the various units therein. The casing 8 is supported whereby it is held against rotation and, in the illustrated structure, by the fastening to .the differential housing 4. v

The input shaft 23 is suitably rotatably supported by bearings 24 carried by the forward plate or wall 10, and said input shaft 23 may be the rear end section of a `universal joint or a drive shaft or other means of connection to a source of power. In the illustrated structure, the input member 23 is a part of a universal joint 23' on the rear end of a drive shaft Z5 which is connected by. a universal joint 26 to the engine shaft 6. The input member is coaxial with a main transmission shaft Z7 `extending longitudinally of the casing 8. p The forward end of the shaft 27 is tapered as at 28 and is secured in a tapered bore 29 of the hub of a bell gear 30 of the first gear train or set 16 by a key 31, said bell gear being held on the tapered portion f the main shaft 27 by a suitable fastening device such as a nut 32 threaded on a threaded end 33 at the forward end of said shaft. A portion of the hub of the bell gear extends into a socket 34 in the input member 23 and is drivingly connected thereto by suitable splines 35 whereby rotation of the input member 23 rotates the bell gear 30 which gear is one of the elements of the gear set 1 6. The bell gear 30 opens to the rear and has an internally toothed ring gear portion 36. Gears or pinions 37 are rotatably mounted on pinion bearing pins 38 carried by the partition 14, said gears or pinions 37 meshing with the ring gear portion 36 and with a gear 39 arranged at one end of a sleeve 40 having a bore 41 through which the main shaft 27 extends whereby said sleeve surrounds the main shaft and extends rearwardly into the chamber 18. The sleeve 40 is rotatably mounted in bearings 42 carried by the partition 14. The sleeve 40 terminates substantially midway the length of the chamber 18.

A pump member or impeller 43 of an hydraulic fluid coupling 44 is arranged in the chamber 18 and is fixed on the sleeve or tubular shaft 40 in a position to cooperate with a driven or turbine member 45 of said hydraulic fluid coupling. The driven or turbine member 45 of the fluid coupling is fixed on a tubular shaft or sleeve 46 having a bore 47 through which the main shaft 27 extends whereby the sleeve 46 surrounds said shaft. The sleeve 46 is rotatably mounted in bearings 48 carried by the partition 17. 1t is preferable to have a thrust washer 49 between the adjacent ends of the hub of the bell gear 30 and the sleeve 40, a washer 50 between the adjacent ends of the sleeves 40 and 46 and a washer 51 between the rear end of the sleeve 46 and an anti-friction bearing 52 carried on the shaft 27 as later described. It is also preferable that the end portions of the bores 41 and 47 of the sleeves 40 and 46 respectively have bearing portions 53 to aid in supporting said sleeves on said main shaft 27, particularly if the bearings 42 and 48 should become worn.

The impeller 43 and driven or turbine member 45 of the uid coupling 44 each have toroidal shells 54 and are bladed with the blading so constructed that the impeller drives the driven or turbine member by means of fluid in the coupling and in the same direction thereof, there being inclined passages 55 communicating the interior of the toroidal shells of the uid coupling with the chamber 18 adjacent the sleeve 40 whereby fluid from the chamber 18 may enter into the fluid coupling 44 or be withdrawn therefrom. The shaft 27 adjacent to and rearwardly of the bearing 52 has an enlarged portion 56 on which a sun gear 57 of the third gear train or set 20 is secured as by a key 57. The shaft 27 has a reduced rearward extension 56 rotatably mounted in a bearing 58 in a hub 59 of a spider or carrier 60 which carries pinion bearing pins 60 each rotatably mounting a planet gear or pinion 61 meshing with the sun gear 57 and with an internally toothed ring gear 62 in a flange portion 63 extending rearwardly from a web 64 rotatably mounted on the bearing 52. The web 64 and flange 63 are part of a ring or brake wheel 65 which has a forward extending flange 66 provided with an internally toothed ring gear 67 of the second gear train or set 19 meshing with pinions or gears 68 which also mesh with a sun gear 69 on the rear end of the sleeve 46, said pinions or gears being rotatably mounted on bearing pins 70 carried by the partition 17. A spider or carrier 71 is secured as by fastening devices such as screws 72 to the flange 63 of the ring wheel 65, said spider being fixed to a reverse sun gear 73 of a reverse or fourth gear train or set 21 rotatably mounted on the hub 59 and meshing with planet gears or pinions 74 rotatably mounted on bearing pins 75 carried by a spider or carrier 76 having ahub connected 4 to the hub 59 by splines 77. The hub of the spider 76 forms the output shaft 22 that is connected with the member to be driven.

A reverse brake wheel 78 is rotatably mounted by bearings 79 on the spider or carrier 76, said brake wheel having a forwardly extending flange 80 provided with internally toothed ring gear portion also meshing with the planet gears 74. A reverse brake band 82 is arranged in the casing and adapted to be tightened on the periphery of the ring wheel flange 80. Also, a forward brake band 83 is arranged in the casing 8 and adapted to be tightened on the flange 63 of the ring or brake wheel 65.

It is preferable that each of the gears 37, 61, 68 and 74 be mounted on the respective bearing pins 38, 60', 70 and 75 by means of anti-friction bearings such as needle bearings 84. it is also preferable that the bearings 24, 42, 48, 52 and 79 be anti-friction bearings such as ball bearings of the semi-seal type. It is preferable that support rings 85 be arranged to connect the free ends of the pinion gear bearing pins to aid in supporting same and that washers 86 be arranged on each side of the respective pinion gears to maintain alignment and allow lubrication clearance. It is also preferable that a suitable oil seal 87 be arranged in the bearing plate 10 exteriorly of the bearing 24 to prevent leakage from the casing.

The arrangement of the brake bands 83 is illustrated in Fig. 2, said band extending around the flange 63 and terminating in ends 88 and 89, the end 88 being engaged by an adjusting screw 90` extending from the casing whereby said screw may be turned to move the band end 88 toward or away from the band end 89, said screw 90 serving as an adjustable abutment or stop for said band end. The band end 89 is engaged by a cam 91 on a shaft 92 that extends from the casing and is connected to a telescoping shaft 93 whereby rotation of the telescoping shaft rotates the shaft 92 and cam 91 to move the band end 89 toward the band end 88 to tighten the band against the ange 63. The arrangement of the brake band 82 is the same as the brake band 83 except in reverse direction with said band 82 being operated by rotation of a telescoping shaft 94. The upper ends of the telescoping shafts 93 and 94 are supported in a housing 95 carried by the vehicle frame 96 and arms 97 and 98 are fixed to the respective shafts 93 and 94 and connected to armatures 99 and 100 of solenoids 101 and 102 respectively whereby operation of the solenoids will rotate the respective cams 91 to actuate the brake bands 83 and 82 respectively, as later described.

In order to provide for lubrication of the components, oil is pumped from the chamber 15 through a duct 104 by a pump 185 which normally delivers the oil through a duct 106 to the casing 8 and delivers said oil through passages 107 and 10S extending through the partitions 14 and 17 to the bearing pins 38 and 70 respectively to lubricate the bearings for the respective pinion gears. it is also preferable that the pins 70 have oil passages 109 communicating with the passages 108 and extending through said pins adjacent the web 64 of the ring wheel 65 whereby lubricating oil will be supplied to the gears of the gear sets 19, 20 and 21. It is preferable that the web 64 and spider 71 have suitable openings therein for lightness in weight which will also allow oil to be sprayed therethrough and lubricate the bearing 79 as well as the other bearings in the rear portion of the casing. Oil collecting in the rear portion of the casing is drawn through a passageway 110 which communicates with the duct 104. There is a relief valve 11]. in the duct 106 whereby when the pressure exceeds a predetermined amount, for example, 10 pounds per square inch, the excess is delivered through a duct 112 toa tank 113. The oil pump 105 is preferably driven from a spiral gear 114 on the hub of the bell gear 30, said gear 114 meshing with a spiral gear 115 on a shaft 116 supported in bearings 117 in an extension housing 118 on the forward plate 10. The shaft 116 drives the gears 119 and 120 ltrol of a governor 126. The pump 125 is preferably operatively connected with the power source driving the input shaft 23 of the transmission whereby said pump v125 is driven at all times that thev power source is operated. In the illustrated structure, the pump shaft 127 has a pulley 128 thereon that is operativelyconuected by a belt 129 withsanf engine driven'xpulley 130. In'the illustrated structure,`,the governordrive shaft 131 is operatively connected with the pump shaft 127; however, it is to be understood that the governor shaft 131 may be independently. driven `by the engine or power source whereby the governor 126` is operating at any time the power source or the input shaft 23 is operated. The fluid is supplied to the chamber 18 through a duct 132 communicating through a passage 133 illustrated las extending .through the partition 14 with a port 134 communicating with the chamber 18 at the height of the desired minimum lluid level in the fluid coupling chamber `18. In the illustrated structure, the port 134 is preferably on a level with the inner portion of the toroidal shell of the lower portion of the coupling, as illustrated in Fig. 1.

The duct or ilow line 132 is connected with the governor 126 whereby valves operated thereby control the .movement of the hydraulic iluid `to and from thecom- 'partment or chamber 18. The governor 126 consists of a housing 135 with a chamber 136 extendingV inwardly from one end 137 thereof. VThe open` end of the chamber is'closed by a plate 138 having a bearing 1-39 rotatably Ymounting thegovernor drive shaft 131 which extends into -the chamber 136.l The drive shaft 131 terminates intermediately of the length of the chamber, and 'a governor fly wheel 140 is fixed on the end of Saidshaft. A plurality of ily weights 141 are fixed on cables 142 intermediatethe ends of the cables with one end of the respective cables secured to ears 143 on one side of a web 144 of the governor ily wheel l140. The other ends of the cables142 are connected to ears 145 extending radially from a carrier 146 slidably mounted on the shaft 13.1, Y

said carrier having a key 147 slidably engaged in a longitudinal groove 148 in said shaft whereby the carrier will rotate with the shaft and fly wheel, with the ily weights equally spaced circumferentially of said shaft.

vA spring 149 is sleeved on the shaft 131 with one end engaged with an enlarged portion 150 of the shaft and the other engaged with a cup-shaped washer 151 engaging the carrier whereby the spring urges the carrier away from the ily wheel and centrifugal force acting on the ily weights 141 will cause the carrier to be moved toward the ily wheel and compress the spring 149. An arm 152 is supported on the carrier by means of bearings 153 whereby the arm is movable longitudinally of the shaft 131 with said carrier. The arm 152 extends radially from the carrier and has the outer end thereof slidably 'mounted in a groove 154 of the housing 135 to retain the arm against rotative movement. The other end of the arm extends diametrically oppositely from the `carrier and has a socket member 155 provided with an insulated lining sleeve 156 in which is slidably mounted la carbon brush 157, a spring 158 being arranged in the insulated socket to urge the carbon brush outwardly into engagement with an idle block contact 159 at low speeds, and then during upward movement of the brush as speed of the governor is increasedl the brush will be moved longitudinally of a resistance coil 160, and then at high speeds the brush will move fromthe resistance `goil into engagement with an insulating block 161. .The

brush 157 is 'connected by a conductor 162, the resistance -is connected by a conductor 163 and the idle contact 159 -on one end thereof and the other ends of the arms extending radially inwardly from the ears and engaged with a bearing member 168 on the end of a longitudinally movablelvalve member 169 whereby centrifugal force acting on the weights 167 tends to move the valve member 169 toward the end 170 of the governor housing 135,` said valve member being reciprocable in a valve bore 171 in said housing. A spring 172 is sleeved on the valve member with one end engaged with an enlarged portion 173 thereof adjacent the bearing 168 and the other end engaged with a collar 174 sleeved on the valve member and held by the spring in engagement with a cam member 175 rotatably mounted on the valve member and having an end cam surface 176 cooperating with an end cam surface 177 on `the end 178 of the governor chamber 136 whereby rotation of the cam member 175 moves the collar 174 relative to the end 178 of the valve chamber to vary the pressure exerted by the spring 172 against the valve member tending to move same .away from the end of said housing.

The cam member has an arm 179 connected with a rod 180 and suitable linkage to the accelerator pedal or throttle lever 181, as later described. The hydraulic fluid tank 113 is connected througha line 182 in communication with a passage 183 in the governor housing which is connected through aline 184 to the intake of the pump. The pump output is connected through a duct 185 to a passage 186 in the governor housing. Said passage 186 communicates through a bypass or relief valve 187 to a return line 188 leading to the tank 113, the bypass or relief valve being set to open when the pressure in the passage 186 is excessive, for example, more than 40 pounds per square inch. Thev passage 186 communicates with the valve bore 171 through a port 190 which, when the governor is in a balanced condition, is normally closed by a valve land 191. The valve member 169 has a reduced portion 192 which, when the centrifugal force of the Weights 167 causes the valve member to be moved during operation of the governor toward the end 170 of the housto closed position by a solenoid 196 as later described.

The passage 183 also communicates through a port 197 with the valve bore 171 when the governor ily wheel is stationary or in unbalanced condition as where the engine speed is lower than that demanded by the accelerator position, and the valve member 169 is moved to a position to close the port 190 whereby the reduced portion 192 provides registration between the passage 193 and port 197.

The electric circuit for the transmission and control thereof is particularly illustrated in Fig. 9. A solenoid 101 is for operating the band 83 or forward band, and

the solenoid 102 is to operate the band 82 or reverse band. Each of said solenoids are of the double-acting type, the solenoid 101 having a winding 200 which when energized 4moves the solenoid to release the engagement of the band from the wheel `flange 63, and the winding 201 which when energized moves the solenoid to effect engagement of the band 83 with the wheel flange 63. The solenoid 102 has a release winding 20,2, and

an engagement effecting winding 203 which when energized will actuate the solenoid 102 to respectively release and engage the band 82 with the respective wheel flange 80.

The electrical circuit includes a battery 204, one side of which is grounded as at 205. The other side of the battery is connected through a conductor 206 to an ignition switch 207 which is preferably of a type that would be conventional for use on present day `automobiles. The illustrated switch 207 has an arm 208 connected with the conductor 206 and having an elongate contact 209. A second contact 210 is supported on and insulated from the contact 209, said contact 210 being grounded as at 211. When the vehicle is being parked, the switch arm is preferably positioned as illustrated in dotted lines -as at 212, Fig. 9, where the contact 210 completes the circuit between the conductors 213 and 214 which connect with conductors 215 and 216 respectively connected to one end' of the windings 201 and 203 respectively. The other end of the winding 201 is connected through a conductor 217 and a fuse 218 to a conductor 219, and the other end of the winding 203 is connected through a conductor 220 and fuse 221 to the conductor 219 which leads to a contact 222. The conductor 219 is also connected through a fuse 223 to conductors 224 and 225 which lead to ends of the respective windings 200 ,and 202. The other ends of said windings are connected to a conductor 226 which leads to a contact 227 of a solenoid switch 228. The other contact 229 of said switch is grounded as at 230.

The switch 228 is of the momentary contact relay type wherein the switch element 231 is in the position shown in full lines when the winding 232 is deenergized and when the winding is energized, the element 231 is moved momentarily to complete the circuit between the contacts 227 and 229 and then to the position sh-own in dotted lines, Fig. 9.

When it is desired to start the engine 1, the switch arm 20S is swung to the position shown in solid lines, Fig. 9, to complete the circuit from the battery through the conductor 206, switch arm 208, and contact member 209, to engage the Contact 222 and the contact 233 which is connected through a conducto-r 234 and usual ignition fuse 235 to the ignition system of the engine designated 236. The contact 233 is also connected through a conductor 237, fuse 238, branch 239, to the winding 232, the other end of said winding being connected to the conductor 164 which leads to the idle contact or block 159.

When the engine is stopped, the brush 157 is engaged with the block 159 whereby the circuit is completed through the conductor 162 to a solenoid winding 240, the other end of said winding being grounded as at 241. When the solenoid 240 is energized, it moves a spring biased switch member 242 into the position illustrated in Fig. 9. The switch member is normally spring biased to engage the contacts 243 and 244, as later described. Energizing of the winding 232 moves the switch member 231 to a momentary engagement of the contacts 227 and 229 whereby current flows from the battery through the switch member 209, contact 222, conductor 219, fuse 223, branch conductors 224 and 225, release windings 200 and 202, conductor 226, to effect release of the bands 83 and 82 respectively from their respective wheel flanges through movement of the solenoids 101 and 102 to the release position. When the ignition switch is swung to start position, the switch member 209 engages the contacts 222 and' 233 and also a contact 245 which is connected by a conductor 246 through a switch 247 to a starter motor 248 on the engine 1. The switch 247 is a neutral selection switch and must be in closed position in order to complete the circuit to the starter motor. Otherwise, the engine cannot be started. The neutral selection switch 247 Ais interconnected with a drive switch 249, a direct drive switch 250 and a reverse switch 251 wherein the switch buttons are interconnected whereby only one switch may be in circuit making position at any one time, and moving a switch to a circuit making position will move the other switch buttons to circuit breaking position. These interconnected switches are of conventional type such as used on present day push buttons commonly used on push button controls of automobile automatic transmissions.

After the engine is started, the ignition switch arm 208 is retracted slightly to break the circuit with the contact 245 butto maintain the circuit through the contacts 222 and 233. This continues the circuit through the conductor 237 to a branch 252 which is connected to one end of the winding for the solenoid 196. The other end of the Winding is connected through a conductor 253 to a switch arm 254 ofthe drive switch 249. However, the circuit to the winding of the solenoid 196 is interruped except when the drive switch arm 254 is in circuit making position to complete the circuit to a ground as at 255. When the winding of the solenoid 196 is energized, it moves the valve to close the bypass port 194. The drive switch 249 includes the switch arm 256 connected by a conductor 257 with the conductor 164 which when the drive switch is in circuit making position causes the switch arm 256 to be in circuit making contact with a contact 258 connected by a conductor 259 to a contact '260 of a switch moved by the gas pedal 181, said gas pedal switch having an arm 261 which is movable to complete the circuit from the contact 260 to a contact 262 that is grounded as at 263. The drive switch also has a switch arm 264 connected through a toggle switch type circuit breaker 265 to the conductor 215. Said switch arm is manually operated and when in circuit making position engages a contact 266 which is connected by a conductor 267 to a contact 268 of a brake pedal switch having an arm 269 adapted to complete the circuit to a contact 270 connected by a conductor 271 to the contact 243. The direct drive switch 250 has switch elements 272 and 273 that are electrically connected by a conductor 274. When the switch 250 is in engaged position, the switch element 273 engages a contact 275 connected by a conductor 276 to a contact 277 to complete a circuit through the switch member 242 to the conductor 163 when the solenoid 240 is energized. When the switch 250 is moved into contact making position, it first connects the contacts 278 and 279 which are connected to the conductor 164 and to a ground 279 respectively, and further movement of the switch 250 breaks the circuit between the contacts 278 and 279 and also completes a circuit from a contact 280, that is connected with the conductor 215, to contact 275, and further makes a circuit to a contact 281 connected by a conductor 282, contact 283 and branch 284 leading to the contact 243. Then when pressure is released on the drive switch button 250, a spring 285 moves the switch outwardly to break the circuit to the contact 281. The reverse switch 251 is of the same structure as the direct drive switch 250 and has contacts 286 and 287 connected to the conductor 164 and to the ground 279 respectively, contacts 288 and 289 connected to the conductor 216 and switch contact 277 respectively. The switch has electrically connected elements 291 and 292. The reverse switch 251 is pressed, circuit is made between the contacts 286 and 287, then the circuit is momentarily broken, at which time the circuit is made between the contacts 288 and 289, and then on further movement it is also completed between the contacts 288 and 283 Where upon release of the switch button a spring 293 moves the switch slightly to break the circuit to the contact 283.

The operation of an automatic transmission and controls therefor constructed as illustrated and described with the structure in a vehicle wherein the driven shaft is operatively connected with the traction wheels of said vehicle is as follows: Y t i With lthe engine stopped and the vehicleV at rest, the fluid level in the liuid coupling compartment 18 should be at a minimum level or at the port 134. The ignition switch is movedto position to start the engine, and with the neutral switch 247 in circuit making position, the ignition'switch member 209 will first engage the contacts 222 and 233 which will supply current to the release windings 200 and 202 of the solenoids 101 and 102 `respectively to release the bands 83 andv 82 from engagement with the respective wheel flanges to unlock the transmission. The circuit will then be completed through the contact 245 to the starter motor to start the engine which, when operating,'drives the pump 125 and the governor 126. However, the valve 195 is still in position to open the port 194 and :while the engine is idling the outputof the pump will..mov`e.through the-relief valve 187 and duct 188 to the reservoir. If the engine vspeed is increased, theincrease in speed of the governor will move the valve member 191 and the output from the Apump will flow through the passage 186, port 190 and through the bypass .port 194 and back to the pump. The engine 1, being operatively connectedtothe input member 23, turns at enginezspeed andrdirection the bell gear 30 and shaft 27. .The'gbearing pins 38 of the gears or pinions 37 are-stationary; therefore, rotation of the bell gear 30 `rotates the pinion gears 37 ato rotate the gear 39 in the opposite direction- The-.gear 39is on the tubular shaft 40 to which is fixed the fluid coupling impeller l43,whereby said impeller is rotated in ,the reverserdirection to the rotation-,of the input mem- Aber` 23 and at an increased speed, depending upon the gear ratios of the bell gear 30 and the gear 39 which is preferably on the order of to 1 whereby the impeller rotates at five times the engine speed and in the reverse direction. The shaft`27 `is rotated at engine speed and rotates the sun gear 57 and aresistance to movement of the vehicleholds the spider orcarrier 60 stationary whereby the sun gear57 rotatesrthe planet gears 61 to, in turn, rotate the wheel 65. The bearing pin 70 of the pinion gears 68 being stationary, rotation ofthe wheel 65 rotates the pinion gears 68 and through said pinion gears rotates thegearg69 and tubular shaft 46 to rotate the driven or turbine member 45 of the fluid coupling. The driven member 45 willgrotate in the same direction as the inputmember 23 Vand at la speed depending on the gear ,ratioi'howeven ithas been found that a ratio of -1.75 to 1 is suitable whereby'I the impeller 43 and driven or turbine member; 45 have relative ro- 'tation in the` order of 6.75 to lwhen the. transmission is in neutral or the `output shaft not turning.V4 v

l For forward drive, the drivebutton switch 249 is fnioved nto circuit making position completing the circuit through the solenoid winding 196 to move 'the valver 195 to close the 4by-'pass port 194 which will result in some fluid being pumped through `the duct 132 to VIthe chamber 1'8during idle speed of the engine, but is'uilicient` iiuid to cause the vehicle to creep. I'he circuit between the contacts 260 and 262 remains open; however, current ows through the solenoid winding 232, conductor 164, idle block`9, brush 157, -to the winding 240 to move the'switch inember 242 into engagement with the contacts 277. When the gas pedal 181 is pressed to increase the engine speed from idle, a circuit is made between the contacts 260 and 262. The gas pedal also moves the connection 180 to rotate the cam member 175, and the increased speed of the governor and the y wheel 140 thereof causes the ily ball weights 167 to sense the demand and move the valve member 191 whereby more fluid from the pump can enter the chamber 18. Also, the increased speed of the governor causes the brush 157 to move ,upwardly into engagement with the resistance 160. lAs the speed is increased fromidle, there is a point when the brush A157 contacts both the idle-block andlower end ofthe re- 10 sistance160`to maintain ground for tlie solenoid 240. It the jengine speedislraised above a predetermined amount, `for example, 500 r.p.m., the brush 157 moves oifof the engagement with the resistance 160 breaking the circuit to the solenoid winding 240 whereby the spring will cause the switch member 242 to move into circuit making engagement with the contacts 243 and 244. As the increased volume offluid is supplied to the fluid coupling chamber 18, it raises the level of the uid therein whereby when sufficient fluid volume is obtained in the chamber along with thereltive diierence in rotation of the impeller and driven .members 43 and 45 respectively, the iluid moves into the toroidal shells and tends to cause the impeller and driven or turbine member to move together. This results in a decrease in the relative rotation between the impeller and driven or turbine member, and for the ratio decrease it also changes the relative speed between the wheel 65 and sun gear 57 whereby the carrier or spider 60 and the output shaft 22 thereon must rotate, causing the vehicle to move. Fluid will be continued to be pumped into the iluid unit until a balance is ,reached between the` engine r.p.m. and the 4vehicle speed. The amount of fluid required to iill the chamber 18 is relatively small and the pump can quickly supply that quantity so the response in the fluid coupling is fast. If the fthrottle is opened further causing more r.p.m., balance will occur .at a higher vehicle speed. Any time such balance occurs, the uid unit will be completely full and under pressure, and when such balance is reached the transmission will be in full overdrive. Under a very light load, it is estimated that full overdrive can be reached Vat approximately 2 0 miles per hour. From idle to full overdrive, there is no actual shift, only agradual change in ratio. Any time any appreciable difference in balance occurs, either by increased throttle setting yor decreased engine speed, as while climbing a hill, the slowing of the rotation of the wheel V will cause the fly ball weights to reduce the pressure on the valve plunger 169 whereby the spring will move said valve to provide communication between the passages 193 and 183 and then the pump evacuates some of the fluid from the fluid coupling thereby permitting some slippage between the impeller and driven or turbine member, and achange in the ratio Abetween the speeds of the input member 23 and the output member 22', the amount of the change depending upon the load, with the lower speed ratio allowing the engine to produce suiiicient power by increasing or maintaining the r.p .m. to eiciently handle the load without excessively loading the engine. It is preferable that thelinking arrangement from the gas pedal or throttle to the governor sensing collar is arranged whereby fully4 opened throttle-will be reached at thethree-fourths point of lfoot feed pedal travel. v

in the carburetor will remain open but the governor will receive a false signal for less r.p.m. until at the lloor position the foot pedal has moved the sensing collar to a position wherein the governor calls for maximum engine torque rpm.; this may be adjusted for different engines. This provides 'a passing ratio with the engine remaining at the maximum' torque r.p.m. as long as the foot pedal is on the floor, or until the transmission gets to full overdrive. Then the r.p.m.will increase until maximum r.p.m. is obtained from the engine. This system gives maximum possible acceleration in relation to engine power and load at any time from zero miles per hour to top speed. Ifthe lfull throttle is desired with neither full engine r.p.m. nor `maximum torque r.p.m., then by setting' the foot feed pedal at any point from three-quarters .to full Hoor position, the corresponding engine r.p.m. will be' maintained until the transmissionreaches full overdrive.

The circuit breaker 265 provides a brake assist, and if the brake pedal is depressed at speeds wherein the brush 157 is engaged with the insulation 161, current will iiow from the battery through the switch arm 208, contact 222, conductor 219,fuse 218, conductor 217, winding Beyond this point, the throttle -1, conductorw 215;- circuitbreaken 265, switch arm. 264, contact-266V and conductor 267- toy the..brake.operated switch and then-.through.the conductor 271, switch ele.- mentt 242 `to the ground. This energizes vthe solenoid coil 201tto operatefthesolenoid` 101 to.engage thefband83 with the Arespective `drum wheel.. 65 to-provide a gripping and slowing of the driventmember] to assist the conventional brakes. When thespeedzis reducedand the brush 157 engaged with'therresistance. 160 or idle block 159, the lbrake assist circuit isinterrupted .by switch 242. Also, the use of the brake assist is` optional as the circuit breaker switch 265 may be manually .operated to open the circuit and leave .sameinopen conditionl until said switch is manually moved to circuit making position.

When a direct driveisfdesired, bypassing the-fluid unit, the'switch-ZSGv is-pressed=inwardlyand if any of the switches.247, 249er l251rar'e engagedlor in circuit making position, they will be disengagedfto4 breakv the respective circuitrcontrolled thereby. The-making of the circuit by the switch 250, whenthe vehicle is stationary, and the engine at idle speed, willcause-current to How from the battery through the ignitionswitch arm, contact 233, conductor 237, fuse-238, conductor 239, winding 232, conductor 164, bloclci159,A brush 157, conductor 162, winding240vto the ground 241j to energize the solenoid and move theswitch into engagement with the contact 277 `whereby current will low through-the conductor 219, fuse 218, conductor 217, solenoid winding 201, conductor 215, contact 280, switch elements 27 2 and 273, contact 275, conductor 276 through therswitch to the resistance 160, when the engine speedis increased to move the brush 157 into engagement with the resistance 160, whereby'the circuit is conipleted'through` the conductor 162, winding 240, to the ground 241,. This energizes the winding 201l of rhe'solenoid 101 to move the arm 97 and shaft 93 to rotate the cam`91 to applythe band 83 to hold the wheel 65 against rotation. The brush 157 and resistance 160 are to retard the full energization of the solenoid windings to allow some slippage as the bands are applied, thereby eliminating any jerk in starting. Also, when the drive switch 249 is moved to circuit breaking position, the circuit throughthe winding 196 is broken, deenergizing saidwinding whereby the spring 195 moves the valve 195 to open the bypass 194 which causes the pump 125 to evacuate the fluid from the torque converter unit. The cam 91 on the shaft 93, when moved to apply theband 83y in tight engagement with the wheel 65, has a high point 298 near the ende of'the applying movement of the solenoid and arm 97 and beyond that'high point there is a decline 299 which, in eiect, moves the cam past center whereby friction will hold the cam inv applying position until it is moved to band releasing position by action of the solenoid or by action of a cable 300 for manual release, as later described. The cam on the shaft 94 is of the same construction and operates in the same manner. When the bandk 83 is in holdingposition relative to the wheel 65', and the accelerator is depressedto increase the speed of the engine, the engine drives through the input member 23, hub of the bell gear 30, shaft 27, sun gear 57 and planet gear 61. vSince the wheel 65 is held stationary, the planet gears will rotate onl the internally toothed ring gear 62 to effect rotation of the carrier 60 in the same direction `as the rotation of the shaft 27. Said carrier, being connected with the output member 22', provides a directl drive thereto with the rotation of the output member being at a speed ratio determined by the ratio of the gears 57, 61 and 6:2. At higher speeds, when the brush 157 moves out of contact with the resistance 160, the winding 240 will be deenergized and the switch element 242 engaged with the contacts 243 and 244, and the'circuit through the winding 201 of the solenoid 101 will be interrupted; however, the shape of the cam 9.1 will hold the band 83 engaged with the wheel 6.5. to continue the direct drive -in a forward dirotation, until the directdrivev switch 250 is moved to cir? cuit interruptingposition .or .until theengine ,reaches idle whereby the winding 232 is energizedmomentarily and the switch .231-completes, thecircuit through the release winding. 200;;011'A the, solenoid. 101 to swingthewarm 97 andy move thercamlftorelease the V.band v83. When the solenoid2240; isdeenergized by the yengine speed being such that the 4brush 157 engages .the insulation 161, the switch element 242 engages contacts 243 and 244,and then..the,.dir ect drive, switch 250 andreverse switch 251 may bealternately, operated to rock the vehicle as when gettingout of mud'andthe like. To -operate in reverse direction, the.switch.251 is moved;to circuit making position whereby the.. circuit is. completed from the battery through the .ignitionswitch arm 208, conductor 219, fuse 221, br'anch.220, winding,203 of the solenoid 102, conductorl 216, contact 288, switchv elements, 29,1` and 292, contact289, contact 277, switch element 242, conductor .163 and resistance 160, brush 157, conductor 162, winding 240.and to the ground 241 when the engine is operated. at suflicient.. speed whereby the governor` moves the brush 157 into engagement with the winding 160. When the solenoid winding 203 is energized, the solenoid 4102 is actuatedto move the armature and arm 98 to rotate the shaft 94` to movethe cam thereon to tighten the band 82 on the ange 80 of the internal gear 78. When the reverse circuit is energized, the valve 195 is in bypass open position and the tliiid in the uid coupling chamber 18 -isf evacuatedbythe pump 125 to a level of the port-1,34 thereby deactivating the 'fluid coupling. Then operation ofthe engine will cause rotation of the input member 23wherebythe drive isthroughthe hub of the bell gear. 30, shaft-'2.7, sun gear 57, planet gears 61, whereby` the ring gear 62'wil1 rotate in the opposite direction to the shaft 27. The ring gear 62 will carry with it the spider 71y to rotate the sun'gear`73 in the opposite direction to the shaft 27, and the sun gear 73 rotates the planet gears 74 but the internal gear 78 being held stationary will cause the'planet gears74 to move the carriage 76 and rotate same and in turn drive the output member 22' inthe reverse direction to the shaft 27 and the engine, the speed ratio in said reverse bein'g'dependent upon the'gear ratios inthe planetary vgear sets operated thereby. Duringallof this operation, there will be some leakage from the fluid coupling' chamber 18 through the bearings into lthe areas oflthe'gear units. This oil will be scavenged therefrom by the pump A which is driven from the gear 114,said pump'delivering the oilor fluid through the duct'106 back through the passages 107 and 108 to circulate the oil through the bea-ring pins 38 and 70 to supply a continuousl lubrication to the gear units wheneverl the input member 23 is rotated. If the pressure frornthe purnp'105 exceeds approximatelyV l0 pounds 'per squ 'fe inch,v therelief valve 111 wil1 cause the excess uid tofpas'fs,through'-the'conduit 112A to the tank 113.

"When'it isi'desi'redf to park thevehicle, lignition switch arm is turned b ey'c'ln'd the ot position as at 212 whereby the contactrnember 2 10will engage with the park contacts, 301 and 302". vvThe other arcuate portion 209 of the ignition lswitch arm contact will be engaged with the contact 303, which is Vconnected Yby, a conductor 304 to the conductor 2,19.4 Thereby current will'ow from the battery through the conductor 206, switch arm 208, contact member 209, contact 303, Yconductor 304, conductor 219, 2 18 and, l2721, conductors y2 17 and 220, solenoid windings201' and 203, a'n1d conductors 213 and 214, to the @nach l240,1 21.116.392; pntt member 210'th1'0ugh the conductor 2.111y to the. grlinfd, energizing the band engaging coils 201anad'203of the solenoids 101 and 102 respectively 'therebyA operating the `bands"82 and83 to engage A"saine with 'thevrin'g'gea'r 78 and wheel 65 to hold same'against rotation, thereby locking the transmission.` Then the ignition switch is moved to oft position whereby the key can be removed therefrom. It should be noted that in this arrangement the engine cannot operate in the park position. However, it should be underenvases 13 stood that other arrangementsfor engaging the output member 22 or structure keyed thereto could be utilized to hold the vehicle in park position.

In order to provide for taxi starting, the ignition switch 'is turned to on position, 4energizing the solenoid switch 228 to move same by the contacts 227 and 229 to energize the release windings 200 and 202 of the solenoids i101 and 102, thereby releasing `the bands -82 and 83. This requires small current that is usually available in a battery even though it has insufficient charge to operate the starter of the engine. Then as the vehicle is pushed, the cable 300 is suitably actuated to move the lever arm 97 land the cam 91 into band applying position'thereby tightening the band 83 on the wheel 65 whereby it operates in the manner above described for direct drive. The forward movement of the vehicle then turns the engine to effect starting of same. This taxi starting is possible at vehicle speeds as used with manual transmissions. If the transmission is in park position and the -battery completely dead, the cable 300 may be operated to release the forward band 83, and the arm 98 of the reverse band operated to release said reverse band S2 from engagement with the ring gear 78 whereby the vehicle may be towed o1- otherwise moved.

It is to be understood that while I have illustrated and described one form of my invention, it is not to be limited to the specific form or arrangement of parts herein described and shown except insofar as such limitations are included in the claims.

What I claim and desire to secure by Letters Patent is:

1. kIn a transmission mechanism, the combination of .a

vdrive member, a driven member, avhydraulic fluid coupling includingV an impeller member and a turbineY member, a gear train connecting the drive member aud impeller for rotating said impeller, a housing surrounding the `fluid coupling and defining a fluid chamber in which said fluid coupling operates, a second gear train for completing a power train between the turbine member and the driven member, a pump operatively associated with the drive member to be driven in accordance with speed changes thereof and having an inlet and an outlet, -a flow duct communicating'with the fiuid coupling chamber, a bypass duct between the pump outlet and inlet, a pressure responsive means in said bypass duct for opening same in response to a predetermined pressure therein, a governor driven in accordance with speed changes of the drive member, means operative to selectively effect communi-V cation of'the flow duct-with the pump outlet and pump inlet, and means under control of said governorfor reguulating the delivery `of fluid from the pump outlet to the fiow duct whereby when fluid is delivered to the fluid coupling chamber the rotation of` the impeller is effective to drive the turbine member and when fluid is withdrawn from thefluid coupling chamber the effectiveness of rotation of the impeller to drive the turbine member is reduced. t

2. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid coupling including an impeller member and a turbine member, means connecting the drive member and impeller for rotating said impeller, a housing surrounding the fluid coupling and defining a fiuid chamber in which said fluid coupling operates, a gear set for completing a power train between the turbine member and' the driven member and including a sun'gear connected to said drive member, a ring gear, a plurality-of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a second 'ring gear fixed to the first ring gear, a second sun gear connected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively asso-V ciated with the drive member and having an inlet and an outlet, a How duct communicating with the fluid coupling for delivery of fluid to and from said uil coupling chamber, valve means operative to selectively effect cont munication of said fiow duct with the pump inlet and pump outlet, astationary brake means selectively engageable with said first ring gear to hold said first ring gear against rotation, and means cooperating with said stationary brake means for actuating said valve means controlling supply of the fluid to the fiuid coupling chamber to effect communication of the flow duct with the pump inlet whereby when the stationary brake means holds s-aid first ring gear stationary fluid is withdrawn from the fluid coupling chamber and drive is effected from the drive member through the rst sun gear and plurality of planetary pinions and l'carrier therefor to the driven member.

3. In a transmission mechanism, the combination of a drive member, a vdriven member, a hydraulic fluid coupling including an impeller member and a turbine member, means connecting the drive member and impellerfor rotating said impeller, a housing surrounding the fluid coupling and defining a fluid chamber in which said fiuid coupling operates, a gear set for completing a power train between the turbine member and the driven member and including a sun gear'connected to -said drive member, a ring gear, a plurality of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a second sun gear corinected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated'with the drive member and having an inlet and outlet, a flow duct communicating with the fiuid coupling chamber, a governor driven in accordance'with speed changes of the drive member, means operative to selectively effect communication of the flow duct with the pump outlet and pump inlet, means under control of said governor for regulating the delivery of fluid from the pump outlet to the flow duct wherebywhen fluid is delivered to the fluid coupling chamber the rotation of the impeller is effective to drive the turbine member and when fluid is withdrawn from said fluid coupling chamber the effectiveness of rotationof the impeller to drive the turbine member is reduced, a stationary brake means selectively engageable with said first ring gear to hold said first ring gear against rotation, and means cooperating with said stationary brake means for withdrawing fluid from the fluid coupling chamber whereby holding of said first ring gear stationary effects the drive from the drive member through the first sun gea-r and plurality of planetary pinions and carrier therefor to the driven member.

4. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid cofutrain between the turbine member and the driven member and including a sun gear connected to said drive member, a ring gear, a plurality of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a second sun gear connected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated with the drive member and having an inlet and outlet, a fiow duct communicating with'the fluid coupling chamber, a bypass between the pump outlet and inlet, a governor driven in accordance with speed changes of the drive member, means under 4control of said governor for regulating the delivery of fluid from the pump to the fio'w duct, a valve controlling said by pass whereby when the bypass is closed the fluid from the pump is delivered to the fluid coupling chamber and when the bypass is open the pump removes lfluid from said fluid coupling chamber, a stationary brake means selectively engageable with said first ring gear to hold said first ring gear against rotation, and means cooperating with said stationary brake means for actuating the bypass valve to open said bypass whereby the fluid is withdrawn from the fluidcoupling chamber and holding of said first ring gear stationary effects the drive from the drive member through the first sun gear and plurality of planetary pinions and carrier therefor to the driven member.

5. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid coupling including an impeller member and a turbine member, means connecting the drive member and impeller for `rotating said impeller, a housing surrounding the fluid coupling and defining a fluid chamber in which said fluid coupling operates, a gear set for completing a power train between the turbine member and the driven member and including a sun gear connected to said drive member, a ring gear, a plurality of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a second sun gear connected to said reaction member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated with the drive member and having un inlet and outlet, a flow duct communicating with the fluid coupling chamber, a bypass between the pump outlettand inlet, a governor driven in accordancerwith speed changes of the drive member, means unden control of said governor for regulating the delivery of fluid from the pump to the flow duct, a valve controlling said bypass whereby when the bypass is closed the fluid from the pump is deliveredV to the fluid coupling chamber and when the bypass is open the pump removes fluid from said fluid coupling chamber, a reverse power train including a third sun gear connected to the first ring gear for rotation therewith, a third carrier continuously connected with the driven member, a third ring gear rotatably mounted relative said third carrier, a set olf planetary pinions carried on said thind carrier and meshing with said third sun and ring gears, a stationary brake means selectively engageable with said third ring gear t hold same against rotation, and means cooperating with said stationary brake means for opening theV pump bypass whereby fluid is withdrawn from the fluid coupling chamber and holding of said third ring gear stationary effects the drive of the driven member in reverse direction to the rotation of the drive member.

6. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid coupling including an impeller member and a turbine member, a gear set connecting the drive member and impeller for rotating said impeller, a housing surrounding the fluid coupling and defining a fluid chamber in which said fluid coupling operates, a second gear set for completing a power train between the reaction member and the driven member and including a sun gear connected to said drive member, a ring gear, aV plurality of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a second sun gear connected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a' pump operatively associated with the drive member and having an inlet and outlet, a flow duct communicating with the fluid coupling chamber, a bypass between the pump outlet and inlet, a governor driven in accordance with speed changes of the drive member, means under control lof said governor for regulating the delivery of fluid from the pump to the flow duct, a valve controlling said bypass whereby when the bypass is closed the fluid from the pump is delivered `to the fluid coupling chamber and when the bypass is open the pump removes fluid from said fluid coupling chamber, a stationary brake means selectively engageable with said rst ring gear to hold said first ring gear against rotation, and means cooperating with said stationary brake means for actuating the bypass valve to open said bypass whereby the fluid is withdrawn fro'm the fluid coupling chamber and holding of said first ring gear stationary effects the drive from the drive member through the first sun gear and plurality of planetary pinions and carrier therefor to the driven member, a reverse power train including a third sun gear connected to the first ring gear for rotation therewith, a third carrier continuously connected with the driven member, a third ring gear rotatably mounted relative said third carrier, a set of planetary pinions carried on said third carrier and meshing with said third sun and ring gears, a second stationary brake means selectively engageable with said third ring gear to hold same against rotation, and means cooperating with said second stationary brake means for opening the pump bypass whereby fluid is Iwithdrawn from the fluid coupling chamber and holding of said third ring gear stationary effects the drive of the driven member in reverse direction to the rotation of the drive member.

7. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid coupling including an impeller member and a turbine member,"means connecting the drive member and impeller forrotating said impeller, a housing surrounding the fluid coupling and defining a fluid chamber in which said fluid coupling operates, a gear set for completing a power tnain betweenthe turbine member and the driven member and vincluding a sun gear connected to said drive member, a ring gear, a plurality of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a .gear train connecting said first ring gear to said turbine member, a pump operatively associated with the drive member and having an inlet and outlet, a flow duct communicating with the fluid coupling chamber, a bypass duct between the pump outlet and inlet, a governor driven in accordance with speed changes of the drive member, means under control of said governor for regulating the delivery of fluid from the pump to the flow duct, a valve controlling said bypass whereby when the bypass is closed'the fluid from the pump is delivered to the'fluid coupling chamber and when the bypass is open the pump removes fluid from said fluid coupling chamber, a stationary brake means selectively engageable with said first'v ring gear to holdV said first ring gear against rotation, meanscooperating with said stationary brake means for actuating the bypass valve to open said bypass whereby the fluid is withdrawn from the fluid coupling chamber and holding of said first ring gear stationary effects the drive from the drive member throughv the first sun" gear and plurality of planetary pinions and carrier therefor tothe driven member, a reverse power train including a second sun gear connected to the rst ring gear for rotation therewith, a second carrier continuously connected with the driven member, a second ring gear' rotatably mounted relative said second carrier, a setof planetary'pinions carried on said second carrier and meshing with said second sun and ring gears, a second stationary brake means selectively engageable with said second ring'gear to hold same against rotation, an electric circuit,'an' ignition switch in said electric circuit and having three positions which are off, on and park, electric actuators for each of said first and second stationary brake means, each of said electric actuators including a winding which when energized will effect engagement of the respective brake means and a winding which when energized will effect release of said respective brake means, and means connecting the brake engaging windings in circuit when the switch is in parkposition to engage the respective brake means.

8, In a transmission mechanism, the combination of a drivemember, a driven member, a hydraulic uid c'ou pling including an `impeller member and a turbine member, means connect'iiigthe drive member and impeller for rotating said impeller, a housing surrounding the lluid coupling and definingv a fluid chamber in which said fluid coupling operates, a gear set for completing a power train betweenthe turbine member and the vdriven member and including a sun gear connected to-said drive member, a ring gear, a` plurality of planetary pinions v meshing with the sun and ring gear, and a planetary `pinioncarrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a sec- `ond sun gear connected to said turbine member, a pluralV ity of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated with the drive member and` having lan inlet and outlet, a flow duct communicating with the liuid coupling chamber, a bypass duct between the pump outlet and inlet, a governor driven in accordance with speed changes of the drive member, means under control ,of said governor for regulating7 `the delivery of fluid from the pump to the ow duct, a valve controlling said bypass whereby when 4the bypass is closed ythe iiuid from the pump is delivered to the liuid coupling chamber and when the bypass is open the pump removes fluid from said fluid coupling chamber, a stationary brake means selectively engageable with said first ring gear to hold said first ring` gear against rotation, means cooperating l with said stationary brake means for actuating the bypass valve to open said bypass whereby the fluid is withdrawn from the iiuid coupling chamber and holding of said first ring gear stationary effects the drive from the drive member through the first sun gear and plurality of planetary pinions and carriertherefor to the driven member, a reverse power train including a third sun gear connected to thefirst ring gear for rotation therewith, a

' third carrier continuously connected with the driven second stationary brake means, each of said electric ac- Y tuators including a winding which when energized -will elfect engagement of the Arespective brake means and a winding which when energized --will effect release of said respective brake means, and means connecting the brake engaging `windings in circuit when the switch is in park position to` engage'the respective brake means.

' 9. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid coupling including an impeller member and a turbine member, a gear set connecting the drive member and impeller for rotating said impeller, a'housing surrounding the fluid coupling and defining a liuid chamber in which said fluid coupling operates, a second gear set for completing a power trainbetween the turbine member and the driven member and including a sun gear connected to said drive member, a ring gear, va plurality of planetary pinions meshing with the sun and ring gear, and a planetary pinion carrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a second sungear connected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated with the drive member and having an inlet and outlet,"a ow duct communicating with the fluid coupling chamber, a bypass duct between the pump outlet and inlet, a governor driven means under control of said governor for regulating the delivery of fluid from the pump to the flow duct, a valve controlling said bypass whereby when the bypass is closed the fluid from the pump is delivered to the fluid coupling chamber and when the bypass is open the pump removes fluid from said'fluid coupling chamber, a stationary brake means selectively engageablewith said first ring gear to hold said first ring gear against rotation, means cooperating with said stationary brake means for actuating the bypass valve to open said bypass whereby the uid is withdrawn from the fluid coupling chamber and holding of said first ring gear stationary effects the drive from the drive member through the first sun gear and plurality of planetary pinions and carrier therefor to the driven member, a reverse power train including a third sun gear connected to the first ring gear for rotation therewith, a third ring gear rotatably mounted relative said third carrier, a set vof planetary pinions carried on said third carrier and meshing with said third sun and ring gears, a second stationary brake means selectively engageable with said third ring gear to hold same. against rotation, means cooperating withsaid second stationary brake means for opening the pump bypass whereby uid is withdrawn from the fluid coupling chamber and holding of said third ring gear stationary effects the drive of the driven member in reverse direction to the rotation of thedrive member, an electric circuit, an ignition switch in said electric circuit and having three positions which are off, on and park, electric actuators for each of said first and second stationary 4bra-ke means, each of said electric actuators including a Winding which when energized will effect engagement of the respective brake means and a winding which when energized will eect` release of said respective brake means, means connecting the brake engaging windings in circuit when the switch is in park position to engage the respective brake means, means connecting the release windings in circuit when the switch is in on position, and a momentary switch actuated by movement of the said iirst-named switch to on position to momentarily complete the circuit to the'release windings to release the respective brake means when the switch is turned to on position. A l

10. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid cou .pling including an impeller member and a turbine member, means connecting the drive member and impeller for Vrotating said impeller, .a housing surrounding the fluid coupling and defining a liuid chamber in which said fluid coupling operates, a gear set for completing a power train between the turbine member and the driven member and including asun gear connected to said drive member, a ring gear,` a pluralityV of planetary pinions meshing with the sun and ring gears, anda planetary pinion carrier continuously connected to the driven member, a second ring gear fixed to the first ring gear, a second sun gear connected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated with the drive member and having an inlet and outlet, a flow duct communicating with the fluid coupling chamber, a bypass duct between the pump outlet and inlet, a governor driven in accordance with speed changes of the drive member, means under control of said governor for regulating the delivery of fluid from the pump to the iiow duct, a valve controlling said bypass whereby when the bypass is closed the fluid from the pump is delivered to the iiuid coupling chamber and when the bypass is open-the pumpy garages 19 bythe fluid is withdrawn -from the fluid coupling charnber and holding of said rst ring gear stationary effects the drive from the Ydrive member through the first sun gear and plurality of planetary pinions and carrier therefor to the driven member, a reverse power train including a third sun gear connected to the first ring gear for rotation therewith, a third carrier continuously connected with the driven member, a third ring gear rotatably -mounted relative said third carrier, a set of planetary pinions carried on said third carrier and meshingwith said third sun and ring gears, a second stationary brake means selectively engageable with said third ring gear to hold same against rotation, means cooperating with `said second stationary brake means for opening theA pump bypass whereby uid is withdrawn from the iluid coupling chamber and holding of said third ring gear stationary effects the drive of the driven member in reverse direction to the rotation of the drive member, an electric circuit, electric actuators for each of said rst and second stationary brake means, each of said electric actuators including a winding which when energized will etect engagement of the respective brake means and a winding which when energized will eiect release of said respective brake means, and means selectively connecting the brake engaging windings in circuit to engage the respective brake means and hold the respective ring gear stationary.

11. In a transmission mechanism, the combination of a drive member, a driven member, a hydraulic fluid coupling including an impeller member and a turbine member, a gear set connecting the drive member and impeller for rotating said impeller, a housing surrounding the iluid coupling and defining a iluid chamber in which said iluid coupling operates, a second gear set for completing a power train between the turbine member and the driven member and including a sun gear connected to said drive member, a ring gear, a plurality of planetary pinions meshing with the sun and ring gears, and a planetary pinion carrier continuously connected to the driven member, a second ring gear Xed to the first ring gear, a second sun gear connected to said turbine member, a plurality of pinions rotatably mounted on stationary axes and meshing with the second sun and ring gears, a pump operatively associated with the drive member and having an inlet and outlet, a ilow duct communicating with the fluid coupling chamber, a bypass duct between the pump outlet and inlet, a governor driven in accordance with speed changes of the drive member, means under control of said governor for regulating the delivery of fluid from the pump to the ilow duct, a valve controlling said bypass whereby when the bypass is closed the iluid from the pump is delivered to the fluid coupling chamber and when the bypass is open the pump removes fluid from said lluid coupling chamber, a stationary brake means selectively engageable with -s'aidrst 'ring gear t'o hold said first ring gear against -rotation, means cooperating with said stationary brake means `for actuating the bypass valve to open said bypass whereby the fluid is withdrawn from the fluid coupling charnber and holding of said rst ring gear stationary effects the drive from the drive member through the'first sun gear and plurality of planetary pinions and carrier therefor to the driven member, a reverse power train including a third sun gear connected to the rst ring gearV for rotation therewith, a third carrier continuously connected with the driven member, a third ring gear rotatably mounted relative said third carrier, a set of planetary pinions carried on said third carrier and meshing with said third sun and ring gears, a second stationary brake means selectively engageable with said third ring gear to hold same against rotation, means cooperating with said second stationary brake means for opening the pump bypass whereby iiuid is withdrawn from the fluid coupling chamber and holding of said third ring gear sta tionary effects the drive of the driven member in reverse direction to the rotation of the drive member, an electric circuit, an ignition switch in said electric circuit and having three positions which are off, on and park, electric actuators for each of said first and second stationary brake means, each of said electric actuators including a winding which when energized will effect engagement of the respective brake means and a winding which when energized will effect release of said respective brake means, means connecting the brake engaging windings in circuit when the switch is in park position to engage the respective brake means, means connecting the release windings in circuit when the switch is in on position, and a momentary switch actuated by movement of the said first-named switch to on position to momentarily complete the circuit to the release windings to release the respective brake means when the switch is turned to on position, and means selectively connecting the brake engaging windings in circuit when the switch is turned to on position for effecting engagement of the respective brake with the respective ring gear to hold same stationary.

References cited in the fue of this patent UNITED STATES PATENTS 2,078,287 Seibold Apr. 27, 1937 2,223,715 Berger Dec. 3, 1940 2,383,981 Lysholm Sept. 4, 1945 2,515,831 McFarland July 18, 1950 2,536,473 Sinclair Jan. 2, 1951 2,570,467 Malachowski Oct. 9, 1951 2,583,312 Wayto Jan. 22, 1952 2,656,675 Coar Oct. 27, 1953 2,876,656 Herndon Mar. 10, 1959 2,894,609 Tattersall July 14, 1959

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